this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Swap the first and last columns
Summing Digits within Text
peta to nano (x-ray)
Is it an Armstrong number?
Scoring for oriented dominoes
Find best domino orientation
Steal, Share, or Catch
Convert a vector into a number
Getting logical indexes
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